Drainage device



F. SCHULTZ DRAINAGE DEVICE sepi. 11, 1934.

Filed Aug. 25, 1952 u Illll." Il

elllnls (it (151:11 luhlecs c ATTORNEY l tity during severe rain storms.

Patented Sept. 11, 1934 UNITED STATES t PAT NT oFFicr.

3 Claims. (Cl.V 18.2-31) This invention relates to a drainage device particularly intended for use upon roofs orL the like, for the purpose of draining oif rain water, especially when theY water accumulates in quan- One of the objects of the invention is to avoid the waterfwhich accumulates on the roof from being drained off too rapidly so that the sewerage system, and consequently the streets, are likely to be iiooded. Through the use of drainage devices constructed in accordance with my invention the accumulation of water on the roof is permitted to drain oil with a relatively constant and easy flow, and the air in the drain pipes is caused to easily be exhausted therefrom, so that undue pressure of water and air inthe pipes is avoided. The improved structure is such that due to the gradual carrying off of the accumulated water, the sewerage system may operate uniformly to dispose of the Water gradually so that the possibility of iiooding sewers and streets is avoided.

Another object of the invention is to provide a drainage system whereby the rain water is retained on the roof and permitted to uniformly iiow oi through the drains without forming air pockets in the drain pipes, such as have been found to cause excess pressure, resulting in backing-up of the ordinary sewerage system with resultant overflowing of basins, toilets, and the like.

With a drainage device of the character described only one sewerage system need be installed in any large building as an overflow of the same during severe rain storms or cloud bursts is avoided.

More speciiically, the invention comprises an arrangement of concentrically positioned pipes or cylindrical members, the inner one of which is spaced from the outer one, and the outer one *formed with a plurality of openings through which water accumulated on the roof may flow. The inner pipe, being smaller in external diarneter than the internal diameter of the outer pipe, forms an annular drain opening between the Vpipes through which the water passes and trickles downwardly while closely following the inner face of the outer pipe, leaving the central portion of the concentric pipes free tor form an air exhaust so that the formation of air pockets in ,the pipes is prevented.

In the accompanying drawing, Fig. 1 is a vertical sectional view through a drain device made in accordance with this invention; Fig. 2 is a sectional view on the line 2--2 of Fig. 1, looking in the direction of the arrows; Fig, 3 is a plan View of the structure shown in Figs. 1 and 2; Fig. 4 is a modified structure wherein the outer casing or cageis'built up from a plurality of super-imposed perforated cylindrical parts; and Fig. 5 is a further modiiication of the invention. 60;

In the structure shown in Figs. 1 to 3 inelusive, 6 indicates the ordinary drain pipe fitted in the roof v'7 :of a building andhaving its upper end terminating substantially flush with the face of thereof. Supported upon the upper edge of 6.5` the pipe 6 is another pipe 8 which projects for some distance above the roof 'and has its lower end 30' extending down into the drain pipe 6.' Lugs 9, attached to theouter fac'e of the inner pipe 8, rest. upon the upper edge ofthe drain y pipe. 6'and are formed with lateral portions which project radially-from the pipe 8 t'of support the pipe 8 thereon. The inner pipe 8 is of smaller external diameter than the internal diameter of the drain pipe 6 so that an annular space or 75j;4 opening 10 is provided between the two pipes 6 and 8, this space 10 forming an outlet through which the water may pass. Weirs 17 are provided at the upper end of the pipe 8. The upwardly projecting pipe 8 is covered by an aper- 80;, tured casing or cage 11 formed with a lateral flange 12 which may be attached to the roof '7. Adjacent its lower end, the casing 11 is formed with a plurality of relatively small drain apertures 13. Above these apertures a group of larger 8,5@` drain openings 14 are provided, these openings 14 being shown in the form of elongated slots. At its upper end the casing is formed with arched bars 15 providing the large openings 16 between them.

From the foregoing, the operation of the device will be readily understood. Any water accumulating on the roof 7 will pass through the relatively small openings 13 and thence pass downwardly through the annular drain opening 10, 9 5'3 trickling down on the inner face of the pipe 6 in the form of an annular stream, following the course indicated by the arrows shown in full lines in Fig. 1. This annular disposition of the stream of water permits the central portion of the drain 10Q pipe 6 and the concentric pipe 3 to act as an air passage so that air in the drain may pass upwardly and outwardly through the upper end or mouth of the pipe 8 and out through the opening 16 in the casing 11. Should a great accumulation of l05Y water be had on the roof, by reason of a severe or violent storm, and the water rise above the small openings 13, it will then pass through the slots 14 in greater quantity, and should the water rise above the topof the casing 11 it will then pass 11.9

down through the concentrically arranged pipes 8 and 6 in the manner similar to an ordinary drain, until the amount of Water on the roof has decreased to a point below the tcp of the inner pipe 8, when the water will then pass out through the annular opening 10 as heretofore explained.

In the structure shown in Fig. 4 the roof 7 is provided with the usual drain pipe 6 and inner pipe 8 having `its lower end projecting'for a short distance into the drainvpipe 6 yto formthexannular drain outlet 10 heretofore described. The outer casing in this structure is composed of a plurality of super-imposed cylindrical sections 18, one of? which rests on top of the other as shown at 19, to form a cage or easing of any suitable height. The uppermost section 18 is provided with a dome-shaped top 20 and enlarged openings or weirs 2l to permit the outward passage'of air,

and in an emergency, to permit water tor enterH and pass through the two concentric pipes 6 and 8.. The sectionslfoiI the casing; are each persv forated at 13inthe mannen` described relativeto. the structure of Figs. 1 toinclusive.

In Fig.` V5 `a .further modication yis shownLwherein". acasin'g 22fsomewhatsimilar tothat oi Fig; L isl shown, except` that. the' openings provided'. in it are( inl the form= of" elongated slots 123: extending for almost `theiullllengthiof'the casing. The `cas,- ingr` 22;i'ssurroundedby an apertured sleeve 24 formedl with, a plurality. off` small' drain openings4 25` and weirs 26.

The operation ofthe severalrdevicesfdescribed: is similar, in .thaty they "enable thewateritrappedi or accumulated on thejroof'todrainoiinA-small? quantities to preventithe overflow ofthe `sewerage system, except wheneveraverylarge quantity'of: water accumulates, inz'which case the devices act:

.formed in it, the small openings being located adjacent to the base of the casing.

2'. In a drainage device, a drain pipe provided ina'froof; a smaller pipe supported on the upper end of the drain pipe and having a portion prof jeeting downward into the drain pipe whereby an annular` drain opening is formed between the smaller pipe and the drain pipe, and an apertured cylindrical casing; iitted over theends of both pipesg, saidcasing having larger openings at its topl and-smaller openings near its base.

3. In'a drainage device, a drainpipe, a pipe-of` smaller'diameter than the drainA pipe havingan endprojecting into the drain'pipe whereby an annulark drain space is formed betweeny both pipes,

the smaller pipe having; a part yrising above rthe upper end of the drain pipe; lugs on the outer faceI of," the, smaller pipe for supporting the same on the end of the drain,v pipe, and an'apertured casing extendingfovery the smaller pipe, the aper turestherein leading; into the annular space located` between the smaller pipe and the drain pipe.4

FRITZ SCHULTZ.

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